Chloromethane
Great Valley Town Water District #3 (bonne Val)
Chloromethane is an industrial solvent, aerosol propellant and a refrigerant. It also forms as a byproduct of water disinfection. The EPA classifies chloromethane as possibly carcinogenic to humans.
6
Samples
0
Samples exceeding legal limit (MCL)
0
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | 1.000 ppb | 1 | 1 | 1.000 ppb |
| 2019 | 1.000 ppb | 1 | 1 | 1.000 ppb |
| 2020 | 0.970 ppb | 1 | 1 | 0.970 ppb |
| 2021 | 1.30 ppb | 1 | 1 | 1.30 ppb |
| 2022 | 0.890 ppb | 1 | 1 | 0.890 ppb |
| 2023 | 0.790 ppb | 1 | 1 | 0.790 ppb |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 2.69 ppb
The EWG Health Guideline of 2.69 ppb for chloromethane was defined by the Environmental Protection Agency as a benchmark for testing under the Unregulated Contaminant Monitoring Rule program. This health guideline protects against cancer.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2018-11-26 | EHS1800051958-01-POC | 1.000 ppb |
| 2019-10-28 | 3067813001 | 1.000 ppb |
| 2020-12-15 | 3148598001 | 0.970 ppb |
| 2021-10-19 | EHS2100095360-POC | 1.30 ppb |
| 2022-10-25 | R2210311-001 | 0.890 ppb |
| 2023-12-13 | R2311584-001 | 0.790 ppb |